Abstract
Floral biochemistry and stress physiology is an underexplored aspect of mangroves, which should be investigated as part of preservation and restoration efforts. A thriving true mangrove tree (Bruguiera gymnorrhiza (L.) Lamk.) and a threatened mangrove-associate species (Heritiera fomes Buch. Ham.) were studied in the Sundarban region of India for seasonal variations in floral odours, non-volatile phytochemicals, antioxidant enzyme activities, and surface water chemistry in surrounding habitat. Both species were found to exhibit significant differences in floral volatilomes, protein contents, antioxidant enzyme activities, total flavonoids, and total phenolic contents between spring and autumn blooms. The bird-pollinated flowers of B. gymnorrhiza also showed considerable seasonal differences in floral anthocyanin and proline contents, indicating vulnerability of the post-anthesis open flowers to environmental factors. Contrarily to previous findings, B. gymnorrhiza floral bouquet appeared to be enriched in various classes of volatiles – dominated by sulphurous compounds in bud stage and terpenoids in open stage. Floral anthocyanins, contributing to the striking colouration of the calyx, were found to comprise cyanidin and delphinidin derivatives. Other glycosides of cyanidin and delphinidin were detected in H. fomes flowers, contributing to visual guides to potential food rewards for pollinating insects. Floral tissue in H. fomes was found to be protected by densely overlapping layers of stellate trichomes containing sesquiterpenoids as phytoprotectants. Comparison of the two floral species suggested that H. fomes flowering is optimized to oligohaline (but not freshwater) vernal conditions; whereas B. gymnorrhiza blooms are adapted for biologically enriched (including abundant herbivores and microbial growth), mesohaline forest habitats.
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Acknowledgements
This work was supported by the Science and Engineering Research Board (SERB) of the Department of Science and Technology (DST), New Delhi, India, with a SERB-National Post Doctoral Fellowship (PDF/2020/000803) allocated to Dr. Ishita Paul. Facilities for microscopy (Dewinter, Stereomaster-Plus and Dewinter, Excel) and UV-VIS spectrophotometer (Shimadzu UV-2600) were provided by the Department of Life Sciences, Presidency University, Kolkata, courtesy of a DST-FIST programme, Government of India (No.SR/FST/LSI560/2013 (c) dated 29.05.2020). Facilities for GC-MS were kindly provided by DBT-BUILDER programme, Government of India (BT/INF/22/SP45088/2022 dated 17.02.2022) at the Department of Life Sciences, Presidency University, Kolkata, and by the Department of Instrumentation and Electronics Engineering, Jadavpur University, Kolkata, courtesy of Dr. Prolay Sharma and Dr. Nilava Debabhuti. We wish to thank the Joygopalpur Gram Bikash Kendra, West Bengal, India, for allowing access to private landholdings for sampling purposes.
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Paul, I., Manna, S., Bera, R. et al. Floral scents, specialized metabolites and stress-response activities in Heritiera fomes and Bruguiera gymnorrhiza from Sundarban mangrove ecosystem. J Plant Res 137, 463–484 (2024). https://doi.org/10.1007/s10265-024-01527-2
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DOI: https://doi.org/10.1007/s10265-024-01527-2